Luo Wenbo, Guo Yanke, Xue Zhiyong, Han Xiuzhu, Kong Qinke, Mu Minghao, Zhang Gaolong, Mao Weimin, Ren Yu
Institute for Advanced Materials, North China Electric Power University, Beijing, 102206, China.
Beijing Institute of Spacecraft System Engineering, Beijing, 100094, China.
Sci Rep. 2022 Jun 29;12(1):11003. doi: 10.1038/s41598-022-14753-2.
Mg-15Gd-1Zn (wt.%) alloy was successfully prepared via the spark plasma sintering rapid solidification ribbons process. Microstructure investigation showed that the sintered alloys consisted of fine grains, the β phase, and long-perioded stacking ordered phase (LPSO). The sintering temperature and time have a significant effect on the microstructural evolution. A lower sintering temperature (430 °C ) was beneficial for obtaining finer grain sizes with less than 5 μm and a higher content of β phase with a content of 3-15 vol.% and a size-distribution of (10-600) nm. A higher temperature for a longer sintering time, 450-470 °C and 5-10 min, helpfully promoted precipitating the abundantly lamellar LPSO phase, and its content was 2-10 vol.% for LPSO phase with the width of (10-100) nm. The mechanical properties indicated that the fine grain size and supersaturated solid solution contributed at least 50% of the yield stress, and the residual contribution was related to the β phase and LPSO phase strengthening, which were based on their contents and the sizes.
通过放电等离子烧结快速凝固薄带工艺成功制备了Mg-15Gd-1Zn（重量百分比）合金。微观结构研究表明，烧结后的合金由细晶粒、β相和长周期堆垛有序相（LPSO）组成。烧结温度和时间对微观结构演变有显著影响。较低的烧结温度（430°C）有利于获得小于5μm的更细晶粒尺寸以及含量为3-15体积%且尺寸分布为（10-600）nm的较高β相含量。在450-470°C和5-10分钟的较高温度下进行较长时间烧结，有助于大量析出层状LPSO相，其含量为2-10体积%，LPSO相宽度为（10-100）nm。力学性能表明，细晶粒尺寸和过饱和固溶体对屈服应力的贡献至少为50%，其余贡献与β相和LPSO相强化有关，这基于它们的含量和尺寸。
